If your funding request is still in "pending" status, you can cancel it on your own accord by accessing the "Pending Fundings" tab which you can locate it at the Dashboard page anytime you have active funding requests.
If the status is showing as "In Progress," it means that our payment processor is already on the process of debiting the funds¹; thus cancellation is not available at this point.

¹ Be advised that any third party extra fees charged  is not under CoinField responsibility, as we have no control over different Banks and Financial Institutions